BER of OFDM systems impaired by carrier frequency offset in multipath fading channels

Authors:
L. Rugini;P. Banelli
Affiliations:
Dipt. di Ingegneria Elettronica e dell'Informazione, Univ. of Perugia, Italy;-
Venue:
IEEE Transactions on Wireless Communications
Year:
2005

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Abstract

We introduce an analytical approach to evaluate the error probability of orthogonal frequency-division-multiplexing (OFDM) systems subject to carrier frequency offset (CFO) in frequency-selective channels, characterized by Rayleigh or Rician fading. By properly exploiting the Gaussian approximation of the intercarrier interference (ICI), we show that the bit-error rate (BER) for an uncoded OFDM system with quadrature amplitude modulation (QAM) can be expressed by the sum of a few integrals, whose number depends on the constellation size. Each integral can be evaluated numerically, or, in Rayleigh fading, by using a series expansion that involves generalized hypergeometric functions. Simulation results illustrate that the theoretical analysis is quite accurate, especially for Rayleigh channels, and also with nonlinear amplifiers.